The main reason for eliminating static electricity is improper use of anti-static tools.
Electronic processing companies and semiconductor factories have done a lot of anti-static protection measures. Electrostatic accidents still exist. The wrong method of using anti-static products is one of the causes of accidents. Based on years of understanding the problems found at the customer's production site, the errors are summarized. Use method or static protection misunderstanding.
First, the anti-static elimination equipment has not been tested according to requirements for a long time, and some of them have not been used to eliminate static electricity, but they are still in use. For example, the ion fan, the surface of the ion needle is already covered with dust, and the ion wind cannot be generated at all. The fan has lost its ability to eliminate static electricity.
Second, the wrong use of anti-static tools, such as: improper use of the wrist strap, anti-static wrist strap must be in close contact with the human body. Because the wrist strap is relatively easy to damage, it needs to be tested every day. A good wrist strap will also be too loose and not conductive because the worker wears it. Therefore, the best method is to monitor the real-time monitor with the wrist strap online monitor. However, there are many companies that do not even have a wrist strap tester. An anti-static wrist strap has been used for many years (the national standard requires a half-year replacement), so that it does not have the effect of static electricity.
Third, anti-static shoes, anti-static clothing is not worn at the same time, in addition to wearing anti-static shoes, but also wear anti-static overalls to better control the human body static. Because clothing can also carry high static electricity during the movement and friction, especially most of the clothing is chemical fiber, which can generate thousands of volts of static electricity.
The production site inspection proves that the operator only wears anti-static overalls, but does not wear anti-static shoes and does not have a good anti-static ground. The anti-static effect cannot meet the standard.